How to install facebook pixel with event codes?

-- HikaShop version -- : 2.6.0
-- Joomla version -- : 3.4.8
-- PHP version -- : 5.5.33

Hi, so I know how to install the "normal" facebook conversion code in the after_end.php file.

However, how do you install the "new" facebook pixel that has 'custom events' ?

If I put it in the template I obviously cannot edit the code for every page and event I want to track. For example, the same code thats in the product page would be in the checkout page. I need to slightly edit the code for each page & event.

How would I go about adding different facebook pixel codes for each and every page? Product page, checkout, 'thank you' page etc...

Best Regards,